Feasibility of Using Unbound Mixed Recycled Aggregates from CDW over Expansive Clay Subgrade in Unpaved Rural Roads
Autor
Rey, Isaac del
Ayuso Muñoz, Jesús
Pérez Galvín, Adela
Barbudo Muñoz, M. Auxiliadora
Jiménez Romero, José Ramón
Editor
MDPIFecha
2016Materia
Construction materialsMixed recycled aggregates
Construction and demolition waste
Expansive clays
Unpaved rural roads
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Social awareness aims to increase practical skills, such as sustainable development, which
seeks to increase the use of different types of waste in construction activities. Although insufficient
attention is sometimes given to these actions, it is essential to spread information regarding new
studies in the field of waste recycling, which encourages and promotes waste use. Reusing and
recycling construction waste in the creation of buildings and infrastructure are fundamental strategies
to achieving sustainability in the construction and engineering sectors. In this context, the concept
of waste would no longer exist, as waste would become a material resource. Therefore, this study
analyses the behaviours of two unbound mixed recycled aggregates (MRA) in the structural layers of
an unpaved rural road with low traffic (category T43). The sections were built on inappropriate soil
(A-7-6) with a high degree of free swelling. The experimental road consisted of three sections: the
first was made with natural aggregates (NA) that were used as a control, the second was composed
of MRA in the subbase and NA in the base, and the third section was completely composed of MRA.
The materials were characterised in the laboratory. The behaviours of the structural layers in the
experimental road were determined by controlling compaction (“in situ” density and moisture) and
measuring the deflections and load capacity (deflectometer) during the 18 months after construction.
The results show that the sections made with recycled aggregates meet the technical specifications
required by General Technical Specifications for Road and Bridge Works (PG-3). Therefore, the
water-soluble sulphate content and Los Angeles abrasion coefficient limits can be increased for
recycled aggregates without compromising the quality of this type of road with low traffic. To the best
of our knowledge, this is the first study regarding the use of unbound MRA made from construction
and demolition waste (CDW) in the construction of an unpaved rural road with low traffic on an
expansive clay subgrade.